Which to use
“fastening” is a verb and “fattening” is an adjective - they look or sound alike but fill different roles in a sentence.
- #37,456
- “fastening” frequency rank
- #40,239
- “fattening” frequency rank
- 77695
- confusion score
Side-by-Side Comparison
| Feature | fastening | fattening |
|---|---|---|
| Definition | present participle and gerund of fasten | That causes weight gain; often of high calorie food with relatively little nutritive value. |
Where the spellings diverge
Shared letters are muted; the letters that actually set fastening and fattening apart are highlighted. They share 8 letters in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
fastening and fattening form a confusable pair in the English index, two distinct headwords that are easily confused because they look alike, sound alike, or both. They differ by a single letter - s in “fastening” becomes t in “fattening” - close enough that the eye skips over the difference, far enough that meaning fully diverges. Our composite confusion score for this pair is 77695, derived from the frequency rank of both members and their visual similarity.
fastening is recorded at frequency rank #37,456, classified as averb, pronounced /ˈfɑːsənɪŋ/. fattening is at rank #40,239, tagged as anadj, pronounced /ˈfæt(ə)nɪŋ/.
Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.
With a confusion score of 77695, this pair ranks #26,558 of 530,003 scored English confusable pairs - among the most confusable pairs.
Frequency comparison
Frequently Asked Questions
Can "fastening" and "fattening" be used interchangeably?
Remembering fastening vs fattening
The fastest way to pick the right one every time.
- Check the role first: if you need a verb, it's “fastening”; for an adjective, it's “fattening”.
- See each word in full, definition, IPA, etymology and its other confusables. Full “fastening” entry
- Browse more pairs most likely to be confused. Most confusable